/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.io.hbase;



import com.bff.gaia.unified.sdk.coders.AtomicCoder;

import com.bff.gaia.unified.sdk.coders.Coder;

import com.bff.gaia.unified.sdk.coders.StringUtf8Coder;

import org.apache.hadoop.hbase.client.Scan;

import org.apache.hadoop.hbase.protobuf.ProtobufUtil;

import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;



import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.Serializable;



/**

 * A {@link Coder} that serializes and deserializes the {@link HBaseQuery} objects using an {@link

 * StringUtf8Coder} to represent the tableId and {@link ProtobufUtil} to represent the HBase {@link

 * Scan} object.

 */

class HBaseQueryCoder extends AtomicCoder<HBaseQuery> implements Serializable {

  private static final HBaseQueryCoder INSTANCE = new HBaseQueryCoder();



  private HBaseQueryCoder() {}



  static HBaseQueryCoder of() {

    return INSTANCE;

  }



  @Override

  public void encode(HBaseQuery query, OutputStream outputStream) throws IOException {

    StringUtf8Coder.of().encode(query.getTableId(), outputStream);

    ProtobufUtil.toScan(query.getScan()).writeDelimitedTo(outputStream);

  }



  @Override

  public HBaseQuery decode(InputStream inputStream) throws IOException {

    final String tableId = StringUtf8Coder.of().decode(inputStream);

    final Scan scan = ProtobufUtil.toScan(ClientProtos.Scan.parseDelimitedFrom(inputStream));

    return HBaseQuery.of(tableId, scan);

  }

}